§ Задание 71
\[\boxed{\mathbf{71}\mathbf{.}}\]

\[100 - 10 - 1 = 90 - 1 = 89\]
\[100 - 20 - 2 = 80 - 2 = 78\]
\[100 - 30 - 3 = 70 - 3 = 67\]
\[\boxed{\mathbf{71}\mathbf{.}}\]

\[100 - 10 - 1 = 90 - 1 = 89\]
\[100 - 20 - 2 = 80 - 2 = 78\]
\[100 - 30 - 3 = 70 - 3 = 67\]